V2EX nondecreasing

Nondecreasing

Definition / 释义

nondecreasing(形容词)不递减的;指数值不会变小,可以保持不变或增大(常用于数学、统计、计算机算法中,如“非递减序列”)。
(注:在某些语境中也可写作 non-decreasing。)

Pronunciation (IPA) / 发音(IPA)

/nn dkris/(美)
/nn dkris/(英)

Examples / 例句

The sequence is nondecreasing.
这个序列是非递减的。

If the function is nondecreasing on \[0, 1\], then larger inputs never produce smaller outputs.
如果函数在区间 \[0, 1\] 上是非递减的,那么更大的输入不会产生更小的输出。

Etymology / 词源

由前缀 non-(表示“非、不”)+ decreasing(递减的,来自 decrease “减少”)构成,字面意思是“不递减的”。该词在技术写作中常用于精确描述“允许相等、但不允许变小”的变化趋势。

Related Words / 相关词

In Literature / 文学与著作中的用例

  • Introduction to Algorithms(Cormen, Leiserson, Rivest, Stein):常在排序、序列与单调性分析中使用 nondecreasing(如“nondecreasing order”)。
  • Concrete Mathematics(Graham, Knuth, Patashnik):在讨论序列与不等式、单调性质时常见该词。
  • Principles of Mathematical Analysis(Walter Rudin):在实分析语境里讨论函数的单调性时会出现类似表述(包括 nondecreasing 这一常用术语)。
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